iPhone users need to update to iOS 9.3.5 immediately as it contains a fix to 3 specific vulnerabilities that till date had probably been marked irrelevant. The vulnerability in iOS came into the limelight when investigators found out about the NSO group, who were selling invisible tracking software.Apple urges users to upgrade to iOS 9.3.5 to avoid being hacked

According to the reports, the NSO group are one of the dangerous digital arms deals of the world and had been using the vulnerabilities in iOS to track and spy on others. Most of the individuals they were spying on were either famous personalities or journalists.

The reports have it that the invisible tracking software by the NSO group that was exploiting iOS’ vulnerability could break in any Apple Inc. Device. The software could read text messages, emails, etc. If the worst fears are to come true, the software can even track and record sounds, location of the Apple device thereby the owner and even read passwords.

Apple Inc. was quick to respond to the situation and has already released a patch in the form of iOS 9.3.5. The users will be able to download the patch just like any other software upgrade download. Apple Inc. fixed the bug precisely 10 days later after receiving a tip from two researchers, Bill Marczak and John Scott Railton, at Citizen Lab at the University of Toronto’s Munk School of Global Affairs and Lookout, a San Francisco mobile security company. Apple Inc. has asked all its users to immediately update the iOS version on their iPhones and iPads.

“We advise all of our customers to always download the latest version of iOS to protect themselves against potential security exploits.”

NSO group had always been bragging about some kind of spyware that allowed them to track keystrokes and movements of their target devices, in turn their target individuals. There was no idea about how they were doing it until now.